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NEW QUESTION: 1
Which of the following is NOT a known type of Message Authentication Code (MAC)?
A. Signature-based MAC (SMAC)
B. Universal Hashing Based MAC (UMAC)
C. DES-CBC
D. Keyed-hash message authentication code (HMAC)
Answer: A
Explanation:
There is no such thing as a Signature-Based MAC. Being the wrong choice in the list, it is the best answer to this question.
WHAT IS A Message Authentication Code (MAC)? In Cryptography, a MAC (Message Authentication Code) also known as a cryptographic checksum, is a small block of data that is generated using a secret key and then appended to the
message. When the message is received, the recipient can generate their own MAC using the
secret key, and thereby know that the message has not changed either accidentally or
intentionally in transit. Of course, this assurance is only as strong as the trust that the two parties
have that no one else has access to the secret key.
A MAC is a small representation of a message and has the following characteristics:
A MAC is much smaller than the message generating it.
Given a MAC, it is impractical to compute the message that generated it.
Given a MAC and the message that generated it, it is impractical to find another message
generating the same MAC.
See the graphic below from Wikipedia showing the creation of a MAC value:

Message Authentication Code MAC HMAC
In the example above, the sender of a message runs it through a MAC algorithm to produce a MAC data tag. The message and the MAC tag are then sent to the receiver. The receiver in turn runs the message portion of the transmission through the same MAC algorithm using the same key, producing a second MAC data tag. The receiver then compares the first MAC tag received in the transmission to the second generated MAC tag. If they are identical, the receiver can safely assume that the integrity of the message was not compromised, and the message was not altered or tampered with during transmission.
However, to allow the receiver to be able to detect replay attacks, the message itself must contain data that assures that this same message can only be sent once (e.g. time stamp, sequence
number or use of a one-time MAC). Otherwise an attacker could - without even understanding its
content - record this message and play it back at a later time, producing the same result as the
original sender.
NOTE: There are many ways of producing a MAC value. Below you have a short list of some
implementation.
The following were incorrect answers for this question:
They were all incorrect answers because they are all real type of MAC implementation.
In the case of DES-CBC, a MAC is generated using the DES algorithm in CBC mode, and the
secret DES key is shared by the sender and the receiver. The MAC is actually just the last block of
ciphertext generated by the algorithm. This block of data (64 bits) is attached to the unencrypted
message and transmitted to the far end. All previous blocks of encrypted data are discarded to
prevent any attack on the MAC itself. The receiver can just generate his own MAC using the
secret DES key he shares to ensure message integrity and authentication. He knows that the
message has not changed because the chaining function of CBC would significantly alter the last
block of data if any bit had changed anywhere in the message. He knows the source of the
message (authentication) because only one other person holds the secret key.
A Keyed-hash message authentication code (HMAC) is a specific construction for calculating a
message authentication code (MAC) involving a cryptographic hash function in combination with a
secret cryptographic key. As with any MAC, it may be used to simultaneously verify both the data
integrity and the authentication of a message. Any cryptographic hash function, such as MD5,
SHA-1, may be used in the calculation of an HMAC; the resulting MAC algorithm is termed HMAC-
MD5 or HMAC-SHA1 accordingly. The cryptographic strength of the HMAC depends upon the
cryptographic strength of the underlying hash function, the size of its hash output, and on the size
and quality of the key.
A message authentication code based on universal hashing, or UMAC, is a type of message
authentication code (MAC) calculated choosing a hash function from a class of hash functions
according to some secret (random) process and applying it to the message. The resulting digest or
fingerprint is then encrypted to hide the identity of the hash function used. As with any MAC, it may
be used to simultaneously verify both the data integrity and the authenticity of a message. UMAC
is specified in RFC 4418, it has provable cryptographic strength and is usually a lot less
computationally intensive than other MACs.
What is the MicMac (confusion) with MIC and MAC?
The term message integrity code (MIC) is frequently substituted for the term MAC, especially in
communications, where the acronym MAC traditionally stands for Media Access Control when
referring to Networking. However, some authors use MIC as a distinctly different term from a MAC;
in their usage of the term the MIC operation does not use secret keys. This lack of security means that any MIC intended for use gauging message integrity should be encrypted or otherwise be protected against tampering. MIC algorithms are created such that a given message will always produce the same MIC assuming the same algorithm is used to generate both. Conversely, MAC algorithms are designed to produce matching MACs only if the same message, secret key and initialization vector are input to the same algorithm. MICs do not use secret keys and, when taken on their own, are therefore a much less reliable gauge of message integrity than MACs. Because MACs use secret keys, they do not necessarily need to be encrypted to provide the same level of assurance.
Reference(s) used for this question: Hernandez CISSP, Steven (2012-12-21). Official (ISC)2 Guide to the CISSP CBK, Third Edition ((ISC)2 Press) (Kindle Locations 15799-15815). Auerbach Publications. Kindle Edition. and http://en.wikipedia.org/wiki/Message_authentication_code and http://tools.ietf.org/html/rfc4418

NEW QUESTION: 2
You are working with an IT department that has embraced Service-Oriented Integration (SOI). The development team has created a catalog of services that rigidly follow the layering of the SOI architecture as illustrated by the Logical View. Clients are allowed to call only Business Process Services, Business Process Services only call Business Services, Business Services only call Data Services, and so on, with each call going through the Mediation Layer. Unfortunately, the quality assurance team has discovered during user acceptance testing that the latency of applications the Business Process Services is unacceptable.
What advice would you give the development team to help reduce the latency without sacrificing adherence to the SOI architecture?
A. Change the SOA Services to bypass the Mediation Layer when calling other SOA Services. The Mediation Layer should be used only between the clients and the SOA Services. The Mediation Layer should not be used between SOA Services.
B. Allow clients and SOA Services to use large-granularity operations. Each operation on the Business Process Service should return an entire data entity or multiple data entities. This reduces the number of client calls required and, therefore, the overall latency.
C. Remove all data transformation from the Mediation Layer because data transformations are too computationally expensive, where required, change the interface of the SOA Services to use a single data model so that data transformations are not needed.
D. The developers are accurately following the SOI architecture. Reducing the latency will require that some of the SOI architecture concepts be relaxed or violated.
Answer: B
Explanation:
Reducing the number of calls could reduce latency.
Note: The Mediation Layer provides loose coupling for the entire architecture. It decouples
the layers of the architecture as well as decoupling external users of the layers from the
specific layers in the architecture.
The primary purpose of this layer in the architecture is to facilitate communication
between layers in the architecture and between this architecture and the systems that
connect to this architecture. This layer is infrastructure in the truest sense and therefore
rarely maps directly to business requirements. However, this layer provides key
capabilities that make the architecture service oriented and is the primary focus for
meeting non-functional requirements such as scalability, reliability, availability,
maintainability, etc.
Reference: Oracle Reference Architecture, Service-Oriented Integration, Release 3.0

NEW QUESTION: 3
A security analyst for a financial services firm is monitoring blogs and reads about a zero-day vulnerability
being exploited by a little-known group of hackers. The analyst wishes to independently validate and
corroborate the blog's posting. Which of the following sources of information will provide the MOST
credible supporting threat intelligence in this situation?
A. Similar cybersecurity blogs
B. Internet searches on zero-day exploits
C. Computer emergency response team press release
D. Threat intelligence sharing groups
Answer: C